If we are serious about greenhouse gas emissions then the only way forward is to realize we need 10x more energy even with the best energy efficiency technology employed globally. And then plan fossil fuel consumption accordingly. But then we have 10x the energy need while we need 10x less ghg emissions long term! I think we will find that in such a future world, we may only use (10% of 10% =) 1% fossil fuels to stay within long term acceptable ghg emissions limits. It is such a drastic reduction that we really need to think about zero carbon economies. CCS with 90% efficiency will not be good enough. It will need to be 99% efficient. Solar and wind grids with 30% natural gas backup will not be acceptable. They will have to be 98% solar and wind and 2% natural gas.

Once you look at those futures it is clear that wind and solar and CCS can’t cut the mustard. They are unacceptable greenhouse gas emitters…

Hence in my opinion such technologies are part of the global energy problem (except for niche uses), not part of the solution.